Did 79 3/4 ton chevy' s come with a crossmember supporting the transfer case? I don't have one on mine and I keep cracking transmissions. Could the crossmember be the cause or is it something else? I have a turbo 400 and a NP 203 transfer case. The transfer case is only supported by the tranny. This is the second time I've cracked a transmission up near where it bolts to the engine. It cracks on the passenger side and the spreads across the top of the bellhousing. Any thoughts would be really appreciated.